Top "Gis" questions

A Geographic Information System (GIS) captures, stores, analyzes, manages, and presents data that are linked to location(s). The GIS Stack Exchange should be considered for questions with this tag.

Openlayers 3 Add Movable Marker with Icon and Text

In OL3, I've succeeded at making a map on which there are movable markers: var mapVectorSource = new ol.source.Vector({ …

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javascript openlayers gis openlayers-3
Openlayers 3: how to select a feature programmatically using ol.interaction.Select?

I'm using OpenLayers v3.6 (this is important, because most of solutions that I found and would potentialy work are for …

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javascript gis openlayers-3
How to convert a GEOS MultiLineString to Polygon?

I am developing a GeoDjango application where users can upload map files and do some basic mapping operations like querying …

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python gis polygon multilinestring geos
Java equivalent of OpenLayers

I am looking for a Java library to display map data from various sources, including shapefile, WMS, WFS, Google Maps, …

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java api swing gis geotools
ST_DWithin takes parameter as degree , not meters , why?

The ST_DWithin document says , the third parameter(distance) is in meters. But when I execute some query , it seems …

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postgresql gis postgis srid
Geo-Search (Distance) in PHP/MySQL (Performance)

I have a MySQL-table (MyISAM) containing about 200k entries of lat/long pairs that I select from, based on the …

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php mysql performance distance gis
Plot circle with a certain radius around point on a map in ggplot2

I have a map with the 8 points plotted on it: library(ggplot2) library(ggmap) data = data.frame( ID = as.numeric(…

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r ggplot2 gis geometry ggmap
Where can I find a city/neighborhood database?

Where can I find a database of cities and neighborhoods using MySQL? I'm only interested in US areas. Price doesn't …

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database gis location city
GeoJSON and MongoDB: Is it worth it to store points as GeoJSON.Point?

With the introduction of 2.3 > MongoDB has become even more useful with location data handling and querying. MongoDB stores documents …

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mongodb gis wgs84 database
How to look up elevation data by lat/lng

I am planning an app that will need the ability to look up the elevation of geographic points by lat/…

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ruby google-maps gis geospatial